Fix @single(createdAtStart=true) silently dropped on definition functions

@module(createdAtStart) and @singleton classes were fixed in RC3.13, but
buildFunctionDefinitionCall — the path for @Single/@singleton definition FUNCTIONS
inside a @module — never propagated the per-definition createdAtStart flag. The
generated buildSingle(...) fell back to the Kotlin default-arg trampoline (false),
so eager init was silently lost (koin#2425/#2415).

Propagate createdAtStart to buildSingle for SINGLE function definitions, mirroring
the class- and top-level-function builders.

Adds box regression test single_fun_created_at_start with a NON-eager @module (so
the module-level flag can't mask the per-definition one): asserts the eager fun is
constructed at createEagerInstances() and the lazy fun is not. Behaviorally proven
(pre-fix: eagerCtor=0 / fails; post-fix: passes). Full box suite green.

Fixes #2425, #2415

Author: arnaudgiuliani

koin-compiler-plugin/src/org/koin/compiler/plugin/ir/DefinitionCallBuilder.kt

@@ -211,6 +211,18 @@ class DefinitionCallBuilder(
                 targetFunction, returnTypeClass, moduleClass, builder, parentFunction, getterFunction
             )
             putRegularArgument(2, definitionLambda)
+
+            // Add createdAtStart parameter if applicable (only for SINGLE).
+            // Without this, `@Single(createdAtStart = true) fun ...` inside a @Module
+            // silently falls back to the buildSingle default (false) — koin#2425.
+            if (definition.createdAtStart && definition.definitionType == DefinitionType.SINGLE) {
+                val createdAtStartIndex = koinFunction.regularParameters.indexOfFirst {
+                    it.name.asString() == "createdAtStart"
+                }
+                if (createdAtStartIndex >= 0) {
+                    putRegularArgument(createdAtStartIndex, builder.irTrue())
+                }
+            }
         }
 
         return if (definition.bindings.isNotEmpty()) {

koin-compiler-plugin/test-gen/org/jetbrains/kotlin/compiler/plugin/template/runners/JvmBoxTestGenerated.java

@@ -42,6 +42,12 @@ public void testModule_created_at_start() {
       runTest("koin-compiler-plugin/testData/box/annotations/module_created_at_start.kt");
     }
 
+    @Test
+    @TestMetadata("single_fun_created_at_start.kt")
+    public void testSingle_fun_created_at_start() {
+      runTest("koin-compiler-plugin/testData/box/annotations/single_fun_created_at_start.kt");
+    }
+
     @Test
     @TestMetadata("singleton_class.kt")
     public void testSingleton_class() {